Least k such that 4*n*k+1 is a prime of the form m^2+1, or 0 if no such k exists.

Terms

a(0) =1a(1) =2a(2) =3a(3) =1a(4) =5a(5) =24a(6) =7a(7) =8a(8) =1a(9) =10a(10) =99a(11) =12a(12) =13a(13) =56a(14) =135a(15) =4a(16) =425a(17) =8a(18) =4275a(19) =5a(20) =84a(21) =352a(22) =368a(23) =6a(24) =1a(25) =234a(26) =12a(27) =28a(28) =116a(29) =120